North Korea keeps world watching

A visitor poses for a photograph next to fence decorated with ribbons, on which people have written their hopes for peace and reunification of the divided Korean peninsula, near the demilitarized zone (DMZ) separating the two Koreas in Paju, north of Seoul April 14, 2013. (REUTERS/Kim Hong-Ji)

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A South Korean soldier (top) patrols at a checkpoint on the Grand Unification Bridge, which leads to the demilitarized zone separating North Korea from South Korea, in Paju, north of Seoul April 13, 2013. (REUTERS/Kim Hong-Ji)

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North Koreans bow to bronze statues of North Korea founder Kim Il-sung (L) and late leader Kim Jong-il at Mansudae in Pyongyang, in this photo taken by Kyodo April 14, 2013, a day before the birthday of the founder Kim Il-sung. (REUTERS/Kyodo)

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South Korean soldiers from an artillery unit participate in a military drill near the demilitarised zone separating North Korea from the South, in Paju, north of Seoul March 29, 2013. REUTERS/Lee Jae-Won

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A South Korean soldier talks with an unidentified man at the gate of an observation post near the demilitarized zone (DMZ) which separates the two Koreas, in Paju, north of Seoul, April 13, 2013. (REUTERS/Kim Hong-Ji)

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North Koreans attend a rally held to gather their willingness for a victory in a possible war against the United States and South Korea in Nampo, North Korea, April 3, 2013 in this picture released by the North's official KCNA news agency in Pyongyang on Wednesday. REUTERS/KCNA

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North Korean leader Kim Jong-un (C) attends a meeting of information workers of the whole army at the April 25 House of Culture in Pyongyang March 28, 2013, in this picture released by the North's official KCNA news agency on March 29, 2013. REUTERS/KCNA

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North Koreans attend a rally held to gather their willingness for a victory in a possible war against the United States and South Korea in Nampo, North Korea, April 3, 2013 in this picture released by the North's official KCNA news agency in Pyongyang on Wednesday. REUTERS/KCNA

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North Korean leader Kim Jong-un (4th R, front row) attends a plenary meeting of the Central Committee of the Workers' Party of Korea in Pyongyang March 31, 2013 in this picture released by the North's official KCNA news agency on April 1, 2013. REUTERS/KCNA

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South Korean soldiers conduct river-crossing operation drills in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, northeast of Seoul April 1, 2013. REUTERS/Lee Hae-ryong/Yonhap

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North Korean women walk in front of portraits of North Korea's founder Kim Il-sung (L) and late leader Kim Jong-il at Kim Il-sung Square in Pyongyang, in this photo taken and provided by Kyodo April 1, 2013. REUTERS/Kyodo

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A soldier stands guard near a barbed wire fence on Hwanggumpyong Island located in the middle of the Yalu River, near the North Korean town of Sinuiju and the Chinese border city of Dandong, March 29, 2013. REUTERS/Jacky Chen

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A transport plane belonging to the U.S. Air Force comes in for a landing at a U.S. air force base in Osan, south of Seoul April 3, 2013. The U.S. has positioned a warship off the Korean coast as a shield against ballistic missile attack, and also deployed radar-evading F-22 Raptors on Sunday to take part in the annual joint military drills it carries out with South Korea. REUTERS/Lee Jae-Won

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South Korean soldiers from an artillery unit participate in a military drill near the demilitarised zone separating North Korea from the South, in Paju, north of Seoul March 29, 2013. North Korea put its missile units on standby on Friday to attack U.S. military bases in South Korea and the Pacific, after the United States flew two nuclear-capable stealth bombers over the Korean peninsula in a rare show of force. REUTERS/Lee Jae-Won

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A F-16 fighter jet belonging to the U.S. Air Force comes in for a landing at a U.S. air force base in Osan, south of Seoul April 3, 2013. The U.S. has positioned a warship off the Korean coast as a shield against ballistic missile attack, and also deployed radar-evading F-22 Raptors on Sunday to take part in the annual joint military drills it carries out with South Korea. REUTERS/Lee Jae-Won

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The inter-Korean industrial park in the North Korean border city of Kaesong is seen in this picture taken from the South Korean observation post near the demilitarised zone separating the two Koreas in Paju in this August 11, 2010 file photo. North Korea threatened on March 30, 2013 to shut down the industrial zone it operates jointly with South Korea over perceived insults that the complex is only being kept running to raise money for the impoverished state. REUTERS/Jo Yong-Hak/Files

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North Korean leader Kim Jong-un (C) presides over an urgent operation meeting on the Korean People's Army Strategic Rocket Force's performance of duty for firepower strike at the Supreme Command in Pyongyang, early March 29, 2013, in this picture released by the North's official KCNA news agency on Friday. REUTERS/KCNA

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North Korean leader Kim Jong-un presides over an urgent operation meeting on the Korean People's Army Strategic Rocket Force's performance of duty for firepower strike at the Supreme Command in Pyongyang, early March 29, 2013, in this picture released by the North's official KCNA news agency on Friday. REUTERS/KCNA

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North Korean leader Kim Jong-Un presides over a plenary meeting of the Central Committee of the Workers' Party of Korea in Pyongyang March 31, 2013 in this picture released by the North's official KCNA news agency on April 1, 2013. REUTERS/KCNA

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A South Korean businessman changes his South Korean license plate to one authorized by North Korea before leaving the South's CIQ (Customs, Immigration and Quarantine) office to go to the inter-Korean Kaesong Industrial Complex in North Korea, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 1, 2013. REUTERS/Lee Jae-Won

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Soldiers play at the banks of Yalu River, near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, March 30, 2013. REUTERS/Jacky Chen

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Children throw stones into Yalu River, at the river banks, near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, March 30, 2013. REUTERS/Jacky Chen

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A soldier stands by a motorbike along the banks of Yalu River near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, March 29, 2013. China called for an easing of tensions on Friday as North Korea put its missile units on standby to attack U.S. military bases in South Korea and the Pacific after the United States flew two nuclear-capable stealth bombers over the Korean peninsula. REUTERS/Jacky Chen

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A South Korean soldier patrols as South Korean trucks leave the South's CIQ (Customs, Immigration and Quarantine) office to go to the inter-Korean Kaesong Industrial Complex in North Korea, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 1, 2013. North Korea said on Saturday it was entering a "state of war" with South Korea, but Seoul and the United States played down the statement as tough talk. REUTERS/Lee Jae-Won

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North Koreans including soldiers attend a rally in support of North Korean leader Kim Jong-un's order to put its missile units on standby in preparation for a possible war against the U.S. and South Korea, in Pyongyang March 29, 2013, in this picture released by the North's official KCNA news agency on Friday. REUTERS/KCNA